After lengthy bartering with the wife, we both agreed on this solution. I wanted the sub and she didnt want to lose any shoping space when I allow her to borrow the Jeep ... lol. Solution was to mount the sub to the back of the seat. Didn't have enough room to use both mounts so I secured the top with mounts and the bottom rests on the floor with the seat up.

I had seen those before and like them, however don't have a spare $600 lying around ...lol. Also would have to add in the amp too. The infinity I had already and is a sub/amp combo. Freed up the cash for my Alpine INA-W910 that's coming in the mail next week !!

Clean install! I had one of those in my last 2 Jeeps...nice little powered units! They are all I've ever really needed and it's small package for the sound you get out of them.
It would be so nice if you could use the trunk lid plastic (basically use the hatch cavity as your box) but I haven't seen anyone do that yet with a WJ or WK.

Still waiting on the wiring, but I did have it in my old car. If you looking to rattle the windows down the street, this isnt it. But if you looking for a small footprint with great bass, this is it. Its an Infinity Basslink Sub. here's the specs: